Op amp noise is generally specified in terms of input current and voltage noise, as previously discussed in MT-047, MT-048, MT-049, MT-050, and MT-051. In communications systems, however, noise is often specified in terms of noise figure (NF)—see Figure 1 below. This can lead to confusion, especially when op amps are used as gain blocks, and the noise figure of the op amp is not specified for the specific circuit conditions.
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